NO. 9 LOW ENGINE COOLANT TEMPERATURE INDICATOR LIGHT/HIGH ENGINE COOLANT TEMPERATURE WARNING LIGHT ILLUMINATES OR FLASHES CONTINUOUSLY [INSTRUMENT CLUSTER]

id0903d5869200

9	Low engine coolant temperature indicator light/high engine coolant temperature warning light illuminates or flashes continuously.
POSSIBLE CAUSE	•  PCM malfunction •  Instrument cluster malfunction •  Connector or pin malfunction •  Short circuit in wiring harness between CAN-L, CAN-H and ground •  Open circuit in CAN wiring harness (CAN-L, CAN-H) •  CAN wiring harness (CAN-L, CAN-H) short each other

Diagnostic procedure

STEP	INSPECTION		ACTION
1	•  Retrieve the DTC of instrument cluster using M-MDS. (See DTC INSPECTION [INSTRUMENT CLUSTER].) •  Is the DTC detected?	Yes	Go to applicable DTC troubleshooting procedure. (See DTC TABLE [INSTRUMENT CLUSTER].)
		No	Go to the next step.
2	•  Cool down the engine. •  Turn the ignition switch to ON position. •  Verify that the high engine coolant temperature warning light condition. •  Does the high engine coolant temperature warning light illuminate or flash while 3— 30 s after the ignition switch is turned to ON position?	Yes	Go to the next step.
		No	Go to Step 5.
3	•  Start the engine. •  Monitor PCM PID ECT using the M-MDS. •  Verify that the low engine coolant temperature indicator light condition when the ECT monitoring value above 55 °C {131°F}[MZR 1.3, MZR 1.5], 40 °C {104°F} [MZ-CD 1.6] •  Does the low engine coolant temperature indicator light illuminate?	Yes	Go to Step 5.
		No	Go to the next step.
4	•  Monitor the PCM PID ECT using the M-MDS. •  Is the PID ECT monitoring value for following value? ―  Above 120 °C {248 °F} when high engine coolant temperature warning light flashes. ―  Above 125 °C {257 °F} when high engine coolant temperature warning light illuminates.	Yes	Troubleshooting is completed. (The system is 3 normal.).
		No	Go to the next step.
5	•  Do the speedometer and tachometer indicate correct?	Yes	Go to the next step.
		No	Go to Step 7.
6	•  Turn on and off both low engine coolant temperature indicator light/high engine coolant temperature warning light using M-MDS instrument cluster active command modes. (See ACTIVE COMMAND MODES TABLE [INSTRUMENT CLUSTER].) •  Do the both low engine coolant temperature indicator light/high engine coolant temperature warning light turn on and off according to active command modes?	Yes	Inspect the ECT sensor. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [MZR 1.3, MZR 1.5].) (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [MZ-CD 1.6].)
		No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
7	•  Disconnect the negative battery cable. •  Measure the resistance between the DLC-2 terminals F and E. •  Is the resistance below 60 ohms?	Yes	Go to the next step.
		No	Go to Step 9.
8	•  Disconnect the negative battery cable. •  Inspect the DLC-2 terminals F and E for short to power supply or ground. •  Is there any malfunction?	Yes	Inspect the wiring harness and CAN system-related module. Repair or replace the malfunctioning part.
		No	Replace the instrument cluster.
9	•  Turn the ignition switch off. •  Inspect the instrument cluster connector terminals for poor connection (such as damaged/pulled-out pins, and corrosion). •  Are the terminals normal?	Yes	Go to the next step.
		No	Repair or replace the terminal.
10	•  Disconnect the negative battery cable. •  Measure the resistance between the instrument cluster connector terminals 2B and 2D. •  Is the resistance 114—126 ohms?	Yes	Inspect the wiring harness and CAN system-related module. Repair or replace the malfunctioning part.
		No	Replace the instrument cluster.